DUBIOUS

1. [s] fraught with uncertainty or doubt; "they were doubtful that the cord would hold"; "it was doubtful whether she would be admitted"; "dubious about agreeing to go"

2. [s] not convinced; "they admitted the force of my argument but remained dubious"

3. [s] open to doubt or suspicion; "the candidate''s doubtful past"; "he has a dubious record indeed"; "what one found uncertain the other found dubious or downright false"; "it was more than dubitable whether the friend was as influential as she thought"- Karen

similar words

1. [a] uncertain

2. [a] unsure

3. [a] incertain

4. [a] unconvinced

5. [a] questionable